16021139 has 2 divisors, whose sum is σ = 16021140. Its totient is φ = 16021138.

The previous prime is 16021129. The next prime is 16021151. The reversal of 16021139 is 93112061.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16021139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16021129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010569 + 8010570.

It is an arithmetic number, because the mean of its divisors is an integer number (8010570).

Almost surely, 2^16021139 is an apocalyptic number.

16021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

16021139 is an equidigital number, since it uses as much as digits as its factorization.

16021139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 16021139 is about 4002.6415028079. The cubic root of 16021139 is about 252.0951339390.

The spelling of 16021139 in words is "sixteen million, twenty-one thousand, one hundred thirty-nine".